A Beta9 tenant can attach a volume when deploying a function, endpoint, or task queue. The gateway builds the host path by joining the shared volumes root, the workspace name, and the volume identifier from the stub configuration. Nothing checks that the identifier names a volume that workspace owns. Parent-directory segments in the identifier collapse the joined path to the worker's filesystem root, and the worker bind-mounts that path into the sandbox read-write unless the volume was explicitly marked read-only. A tenant with a workspace token can therefore read and write the worker's files, including other tenants' volumes stored on that machine. Confirmed against gateway 0.1.769 and worker 0.1.745. Fixed in gateway 0.1.776 and worker 0.1.756: volume identifiers and mount paths are validated before a mount is built, including for stubs saved before the check existed, and the gateway rejects a volume that does not exist or is not owned by the workspace.
"}],"value":"A Beta9 tenant can attach a volume when deploying a function, endpoint, or task queue. The gateway builds the host path by joining the shared volumes root, the workspace name, and the volume identifier from the stub configuration. Nothing checks that the identifier names a volume that workspace owns. Parent-directory segments in the identifier collapse the joined path to the worker's filesystem root, and the worker bind-mounts that path into the sandbox read-write unless the volume was explicitly marked read-only. A tenant with a workspace token can therefore read and write the worker's files, including other tenants' volumes stored on that machine. Confirmed against gateway 0.1.769 and worker 0.1.745. Fixed in gateway 0.1.776 and worker 0.1.756: volume identifiers and mount paths are validated before a mount is built, including for stubs saved before the check existed, and the gateway rejects a volume that does not exist or is not owned by the workspace."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"Tenant with a workspace token deploying a function that attaches a volume"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-668","description":"CWE-668: Exposure of Resource to Wrong Sphere","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-01T12:51:50.481Z","orgId":"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d","shortName":"JFROG"},"references":[{"name":"Beta9 repository","tags":["product"],"url":"https://github.com/beam-cloud/beta9"},{"name":"Handle sandbox edge cases (fix pull request)","tags":["patch"],"url":"https://github.com/beam-cloud/beta9/pull/1897"},{"name":"Fix commit a28bf12","tags":["patch"],"url":"https://github.com/beam-cloud/beta9/commit/a28bf12cf0007c792a25d8ed282b4e8bf6f30393"},{"name":"gateway-0.1.776","tags":["release-notes"],"url":"https://github.com/beam-cloud/beta9/releases/tag/gateway-0.1.776"},{"name":"worker-0.1.756","tags":["release-notes"],"url":"https://github.com/beam-cloud/beta9/releases/tag/worker-0.1.756"},{"name":"gateway-0.1.769 (confirmed affected)","tags":["technical-description"],"url":"https://github.com/beam-cloud/beta9/releases/tag/gateway-0.1.769"},{"name":"worker-0.1.745 (confirmed affected)","tags":["technical-description"],"url":"https://github.com/beam-cloud/beta9/releases/tag/worker-0.1.745"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Upgrade the gateway to 0.1.776 or later and the worker to 0.1.756 or later. Volume identifiers and mount paths are rejected when they are empty, \".\", \"..\", or contain a slash (identifiers) or a \"..\" segment (mount paths). The gateway also refuses a volume the workspace does not own. Stubs stored before the check existed are validated when they are launched. The fix is commit a28bf12 (pull request 1897), released on 2026-09-15.
"}],"value":"Upgrade the gateway to 0.1.776 or later and the worker to 0.1.756 or later. Volume identifiers and mount paths are rejected when they are empty, \".\", \"..\", or contain a slash (identifiers) or a \"..\" segment (mount paths). The gateway also refuses a volume the workspace does not own. Stubs stored before the check existed are validated when they are launched. The fix is commit a28bf12 (pull request 1897), released on 2026-09-15."}],"source":{"discovery":"EXTERNAL"},"timeline":[{"lang":"en","time":"2026-09-07T02:47:00.000Z","value":"Confirmed affected releases worker-0.1.745 and gateway-0.1.769 are current"},{"lang":"en","time":"2026-09-15T04:03:00.000Z","value":"Fix merged in pull request 1897 (commit a28bf12)"},{"lang":"en","time":"2026-09-15T04:04:00.000Z","value":"Fixed releases worker-0.1.756 and gateway-0.1.776 published. No vendor security advisory was filed with the pull request."}],"title":"Beta9 host filesystem exposure via volume path traversal","x_generator":{"engine":"Vulnogram 1.0.5"}}},"cveMetadata":{"assignerOrgId":"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d","assignerShortName":"JFROG","cveId":"CVE-2026-120308","datePublished":"2026-11-01T12:51:50.481Z","dateReserved":"2026-11-01T12:46:51.095Z","dateUpdated":"2026-11-02T19:45:15.233Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-01 13:18:01","lastModifiedDate":"2026-11-02 20:17:40","problem_types":["CWE-22","CWE-668","CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","CWE-668 CWE-668: Exposure of Resource to Wrong Sphere"],"metrics":{"cvssMetricV31":[{"source":"reefs@jfrog.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":9.9,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.1,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-02T19:45:04.950921Z","id":"CVE-2026-120308","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"120308","Ordinal":"1","Title":"Beta9 host filesystem exposure via volume path traversal","CVE":"CVE-2026-120308","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"120308","Ordinal":"1","NoteData":"A Beta9 tenant can attach a volume when deploying a function, endpoint, or task queue. The gateway builds the host path by joining the shared volumes root, the workspace name, and the volume identifier from the stub configuration. Nothing checks that the identifier names a volume that workspace owns. Parent-directory segments in the identifier collapse the joined path to the worker's filesystem root, and the worker bind-mounts that path into the sandbox read-write unless the volume was explicitly marked read-only. A tenant with a workspace token can therefore read and write the worker's files, including other tenants' volumes stored on that machine. Confirmed against gateway 0.1.769 and worker 0.1.745. Fixed in gateway 0.1.776 and worker 0.1.756: volume identifiers and mount paths are validated before a mount is built, including for stubs saved before the check existed, and the gateway rejects a volume that does not exist or is not owned by the workspace.","Type":"Description","Title":"Beta9 host filesystem exposure via volume path traversal"}]}}}